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Should Bandwidth Throttling (BWM) increase Latency on a Sonicwall TZ190?

I have implemented BWM (bandwidth management) on our Sonicwall TZ190's to limit the amount of traffic over the WAN.  I need WAN traffic  limited so that the RDP traffic going over the VPN is not effected with high latency.  However, it appears that with BWM enabled and active it does increase the latency, between 100-250ms.  Without the BWM and WAN traffic sucking up all available bandwidth the latency climbs to over 600ms.

So, BWM does help and works.  However, is it anyone else's experience with BWM that latency would climb like this and should be considered normal?  
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menreeq
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menreeq
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AdamBNYCCommented:
How much pipe do you have going through the TZ170? I used to deploy them all the time, the biggest issue I ran across is that the TZ170 is not rated for pipes bigger than 5mbps. When you turn on the Bandwidth stuff, the weak processor on the TZ170 takes a bad hit and reduces the amount of bandwidth it can handle to somewhere around 2mbps. This may very well be your problem. The processor can't keep up with what you are telling it to do. This info came straight from sonicwall when I had a very similar problem.
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menreeqAuthor Commented:
AdamBNYC, thanks for the feedback.  I have a TZ190 and I think that's a bit more powerful then the TZ170.  I did check the cpu usage on it and it never goes above 50%...would you see the CPU on the 170 max out?
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AdamBNYCCommented:
No, i would not. Anything over like 30% is a problem.
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menreeqAuthor Commented:
AdamBNYC, again that's for the reply.  30% sounds low but I am open to accepting it, can you just tell me how you came to the understanding that anything over 30% is a problem?
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AdamBNYCCommented:
This is what Sonicwall told me when I called a few years back. I strongly suggest you give sonicwall a call yourself. How much bandwidth is coming through your sonicwall?
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menreeqAuthor Commented:
I have 3 megs coming through, thanks...I will call.
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AdamBNYCCommented:
I did some research on the TZ190.  Depending on the features you are turning on, you can cripple it. If you turned everything on, it would probably give you a whole bunch of problems. Below is info i took directly from sonicwall.

http://www.esecuritytogo.com/documents/tz190_datasheet.pdf


Firewall
Nodes Supported Unrestricted
Stateful Packet 90+ Mbps
Throughput
Gateway Anti-Virus 10 Mbps
Throughput
Intrusion Prevention 8 Mbps
Throughput
Gateway Anti-Spyware 6 Mbps
Throughput
Connections 6,000
Policies 250 per zone
Denial of Service
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